Which type of memory is used to store program code in ControlLogix systems?

In ControlLogix systems, program code is stored in Flash memory. Flash memory is non-volatile, meaning it retains data even when power is removed, making it ideal for storing important information like the control program. This form of memory allows updates and modifications without requiring power cycling, facilitating firmware updates and program changes while ensuring that the control program is preserved during power outages.

Volatile memory, such as RAM, loses its contents when power is lost, which is not suitable for storing the control program. Static RAM is a type of volatile memory, and EEPROM can store data without power but generally has a limited number of write/erase cycles compared to Flash memory. Therefore, Flash memory is specifically designed to balance speed, retention, and endurance, making it the most effective choice for storing program code in ControlLogix systems.